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Finding the Fourth Proportional to 57.09, 85.68 and 55.83

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Solution

The fourth proportional to 57.09, 85.68 and 55.83 is: 83.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.09 : 85.68 = 55.83 : x
  2. Step 2: Convert to fraction form
    57.09/85.68 = 55.83/x
  3. Step 3: Cross multiply
    57.09x = 85.68 × 55.83
  4. Step 4: Simplify right side
    57.09x = 4,783.24
  5. Step 5: Solve for x
    x = 4,783.24/57.09
  6. Step 6: Final answer
    x = 83.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.